Typewriting machine



June24, 1930. G. 5. GOING TYPEWRITING MACHINE Filed May 28, 1929WITNESSES 2 Sheets-Sheet 1 ATTORNEY June 24, 1930. G. a. someTYPEWRITING mourns:

Fil ed May 28, 1929 2 Sheets-Sheet 2 'WITNESSES I ATTORNEY j PatentedJune 24, 1930 UNITED STATES PATET oFFICE GEORGE G. some, or STAMFORD,connncr cur, ASSIGNOR To nnivimeron'rxrn- I WRITER COMPANY, or ILION,NEW YORK, A CORPORATION or'nnw YORK 'IIYPEWRQITING MACHINE Applicationfiled May 28, 1929.

My invention relates to typewriting and like machines .and moreparticularly to the case shift mechanism thereof.

The main object of my invention, generally stated, is to provide anoiseless, simple, inexpensive, compact and highly eflicient means forpreventing a rebound of the case shift part, more particularly itsreturn to normal position. i v

To the above and other. ends which will hereinafter appear, my inventionconsists in the features of construction, arrangements of'parts andcombinations of devices set forth in the following description and Uparticularly pointed out in the appended claims.

In the accompanying drawings, wherein like reference characters.designate corresponding parts in the different views,-

Fig. 1 is an enlarged, detail, fragmentary, side elevation, with partsin section, disclosing enough of the typewriting machine to illustratemy invention in its embodiment therein,-said view showing the parts asthey. appear when the carriage is in the lower case position. V

Fig. 2 is a view that corresponds substantially to Fig. 1 except thatthe parts are shown as they are disposed when the carriage is shifted toupper case position.

I have shown my invention embodied, in the present instance, in anoiseless portable typewriting machine of the character disclosedin myapplication Serial #331,534,

, filed Jan. 10, 1929 in which the devices of the present invention maybe readily incorporated without modifying the existing structuralfeatures of said machine. It should be understood, however, that theinvention is not restricted in its use to any particular character oftypewriting and like machine, but may be employed in such machinesgenerally, wherever found available. In fact the nature of-the inventionis such as to enable it to be readily incorporated, as

erial No. 366,623.

an attachment, in typewriting machines that vary materially incharacter.

In the accompanying drawings I have shown only so much of thetypewriting machine as is necessary to illustrate my present inventionin its embodiment therein.

The present invention is in the nature of machine and has fixed theretonear each end a crank arm 5. A counter balance spring 6 for the caseshift mechanism surrounds the rock shaft 41, said spring being securedat one end, as at 7, to the casting 2. The

opposite end of the spring is connected to a collar 8 that is adjustablyconnected to the rock shaft 4 to adjust the tension of the spring on thecase shifted parts. Each of the parallel arms 5 is pivoted at'9 to adepending bracket arm 10 on the case shift frame which in thepresentinstance is in the nature of a carriage support indicated as awhole by the reference numeral 11.

The carriage support 11 extends from side-to-side of the machine and hasoppositely disposed grooved race-ways 12 therein to receive crossedrollers 13 which also are received in oppositely grooved race-ways 14 ina cross bar 15 of the carriage to which end plates 16 are secured at 17.The carriage, which carries a cylindrical platen 18, is thus mounted totravel from side-to-side of the machine on the carriage support 11 andis adapted to shift up and down with said support in the case shiftingmovements of the latter; I

To further guide. and control the carriage in its case shiftingmovements I provide a cross bar 19 secured at its ends by screws 20 tothe end plates 16 of the carriage. The rear casting 2 of the frame atabout midway in the width of the machine has a guide plate 21 securedthereto by screws 22. The cross bar 19 is free to travel with thecarriage across the face of the guide plate 21 and also to slide up anddown thereon when the carriage receives a case shifting move-v ment. Iemploy suitable means, not shown, but which are disclosed in my saidapplication Serial #365,426, for retaining the carriage against forwarddisplacement from the guide plate 21 without interfering with thetravelandrase shifting movement of the is. provided with an opening 28.,the walls of which engage three sides. of a rock shaft 29 which is.square in cross section. The lever 26 is formed with an offset ear 30that underlies. the. rock shaft 29 and is secured thereto by a headedscrew 31. In this manner the lever- 26 and the rock shaft 29. areconnected to rock together- Said rock shaft extends from side-to-side ofthe machine and is mounted at its ends on pivot screws 32 carries by theside plates 1 of the frame. At the left-hand side of the machine thereis provided a second case shift lever or arn; 33 provided with a fingerkey 3%. This lev er arm 33, is connected to the. rock shaft 29 in thesame manner as the lever 26, but

1 of the frame.

In order to limit the case shifting movements of the frame 11 to andfrom normal position I provide stops at both sides of the machine. Inthe present instance each of the stops for limiting the upward motion ofthe shift frame is designated as a whole by the. reference numeral 37.Each of said stops is secured by screws 38 to the casting 2 andcomprises a metal plate 39 beneath which is a l yer of felt 4-0. Thefelt is covered by a very thin metal plate 4C1 bent at its ends, at 4L2,around the ends of the plate 39 and the intervening felt l0 and securingthe latter in place on the stop plate 39. The thin plate 411 constitutesa contact face with which the carriage support 11 coacts to arrest theupward shift movement thereof. The stock from which the plates 39 aremade is such that a slight bend may be given the stops to adjust them.his construction provides for substantially noiselessly arresting'thecarriage in its upward shifting movements.

For arresting the return movement of the carriage, screw stops 48 arereceived in tapped openings in ears 44 on brackets d5 secured by screwsal6 to the side plates 1 of the frame. The lower ends of these brackets45 are supported on the forwardly extending arms 47 of the casting 2.Lock nuts 4L8 may be employed on the screw stops 43 to hold them againstaccidental displacement from their adjusted positions. 'As shown in Fig.1 the case shift frame 11 bears against the heads of the screw stops4;?) and limits the return motion of said frame to normal position.

It should be understood that so far as the present invention isconcerned it is immates rial what character of stops are employed forarresting the case shift frame.

Coming now to the means for preventing a rebound of the shift frame fromnormal position, which constitutes the important feature of thepresentinvention, it will be seen that I have provided a detent devicein the nature of a lever 49 of'the third order. This lever is carried byand pivoted, at 5 0, on the case shift lever 26 to have a bodilymovement therewith and also have a pivotal movement thereon. Theupwardly and rearwardly extending arm of this lever carries a doubledetent roller 51 pivoted thereon at 52. In some instances, however, itmay be found desirable to fix this so-called detent roller againstturning movement. This roller is adapted to enter the space between theforwardly and upwardly inclined part of the carriage support 11 and theupper flattened edge 53 at forward end of the arm 5 when the parts arein the normal position, as shown in Fig. 1. The effect of forcing theroller 51 into the position shown in Fig. 1 is to exert a wedging actionon the parts with which the roller coacts, tending to force the caseshift frame to return to normal position and also maintaining the roller51' extended end of the pivot 9. The force of 49 on its pivot 50 andforce the detent roller thereon into effective wedging position shown inFig. .1. It should be understood that the spring 54 is lighter than thespring 35 and cannot overcome the force of the latter.

' The forward arm of the detent lever 49 carries an off-setfiange 56that overlies the case shift lever 26. This flange is tapped to receivea screw stop 57 adjustable up and down on the flange 56 and adapted tocoact at its upper end with a fixed part 58 of the machine, which in thepresent instance happens to be a part of the type bar segment. A looknut 59 may be employed on the screw stop to hold it against accidentaldisplacementfrom its adjusted position.

The construction is such that when the parts are in the normal positionshown in Fig. 1, the screw stop 57 will engage the fixed part or stop58. At this time the spring 54 holds the detent roller 51 seated againsta case shiftable parts, as pointed out above, whereas the spring 35resists the elevation of the rear end of the lever 26 and the pivotalpoint 50. This results in holding the case shift frame 11 and the partscarried thereby against rebound. The necessity for preventing suchrebound is well understood in the art and need not be elaborated onherein.

\Vhen either of the caseshift keys 27 or 34 is depressed the rear end ofthe lever 26 will be elevated carrying the detent lever up bodily withit and the case shift frame while the screw stop 57 bears against thestop 58. This will result in positively turning the detent lever on itspivot 50 against the force of the spring 54 and in carrying the detentroller51 out of contact with the parts with which it coacts. From a comparison of Figs. 1 and 2 it will be seen that as the carriage is shiftedfrom the lower case Fig. 1 position, to the upper case Fig. 2 position,the forward end of the arm 5 and the carriage support 11 approach eachother and close or contract the space in which the roller-51 is receivedwhen theparts are in the lower case position. However, as the roller 51is positively withdrawn from between these parts in advance of theirapproach towards each other, said roller does not interfere with thecase shifting move ment of the case shift frame.

As the parts return to lower case positiontween the lever 26 and thecase shift frame.

This I do by enlarging the opening vertically in the rear end of thelever 26, as indicated at 60, where the pivotal connection, at 25, iseffected between said lever and the link 24. This enables a preliminarylifting of the detent lever 49 at the first portion of the depression ofeither shift key, and before any motion is transmitted to the case'shift frame and the parts carried thereby. An upward shift of the pivot50 at this time results in turning the detent lever on its pivot 50since the screw stop 57 is held against the part 58. It follows thatthis will result in a partial withdrawal of the detent roller 51 fromits engaged position before motion is transmitted to the case shiftframe 11.

It will be understood that the features for preventing rebound of thecarriage offer but little resistance to the case. shifting movement ofthe carriage to the upper case position, which in itself is an importantfactor.

From what has been said it will be seen that I have provided simple andeffectlve means for preventing a rebound of the carriage from normal,lower case, pos tion in returning the carriage to such pos tion, thesimple addition of the lever 49 attainmg the ends pointed out.

Various changes in the construction may be made without departing frommy invention as it is defined in the accompanying claims.

\Vhat I claim new and desire to by Letters Patent, is: v

1. Case shift mechanism for typewriting and like machines comprising twomembers that have a relative movement one towards the other as the caseshifted part moves away from normal position and have a relative.movement one away from the other as the shifted part returns. to normalposition, a detent, spring means for forcing said detent into wedgingengagement with and between said members as the case shifted partreturns to normal position and thereby prevent a rebound of said partfrom such normal position, and means for positively withdrawing saiddetent from such wedging engagement when the case shifted part is movedaway from normal position.

2. Case shift mechanlsm for typewriting and like machines comprismg twomembers that have a relative movement one toward the other as'the caseshiftedpart moves'away from normal position and have a relative movementone away from the other as the secure that have a relative movement onetowards the other as the case shifted part moves away from normalposition and have a relative movement oneaway from the other as theshifted part returns to normal position, a detent, spring means forforcing said detent into wedging engagement with and between saidmembers as the case shifted part returns to normal position and therebyprevent a rebound of said part from such nor mal position, means forpositively withdrawing said detent from such wedging engagement when thecase shifted part is moved away from normal position, a case shift key,and a lost motion connection between said key and-said case shifted partthat enables a movement of said detent out of engaging position to beeflected before motion is transmitted from'said key to the case shiftedpart. 4. Case shift mechanism for typewriting and like machinescomprising two members that have a relative movement one toward theother as the case shifted part moves away from the normal position andhave a relative movement one away from the other as the shifted partreturns tonormal posi tion, a detent, and automatically operatingcontrolling means for said detent that enable thedetent to bewedged'into position between said members as the case shifted partreturns to normal position and thereby prevent a rebound of said partfrom such position, and which enables said detent to be positivelywithdrawn from obstructing position between said members as the caseshifted part is moved away from normal position, said automaticallyoperating controlling means comprising a stop with which said detentcoacts in the normal position of the parts ready to positively withdrawthe detent, a spring which tends to force the detent into engagingposition, and a lost motion connection that enables a preliminarymovement of the case shift key to start a positive withdrawal of saiddetent with the aid of said stop before motionis trans mitted to saidcase shifted part.

5. Case shift 'mechanism for typewriting and like machines comprising akey actu ated case shift lover, a detent lever pivoted on said caseshift lever and which normally extends into the path ofa case shiftedpart,

a spring which tends to force the detent lever into such position, astop carried by a fixed part of the machine and with which said detentlever coacts to effect a movement thereof around its fulcrum and againstthe force of said spring to releasing position when the case shift leveris actuated, and a lost motion connection between said case shift leverand the part to be given a case shifting n'rowement in order topositively effect a preliminary movement of the detent lever towardsreleasing position under control of said stop.

6. Case shift mechanism for typewriting and likev machines comprising akey actuated case shift lever, a detent lever of the third order carriedby and pivoted on :said case shift lever and one arm ofvwhich coactswith a case shifted part to prevent a rebound thereof from normalposition, a spring which forces said detent lever to effective position,and an adjustable stop carried by said detent lever and coacting with afixed part of the machine when the parts are normal position in order topositively withdraw the detent lever from contact with said ficaseshifted part when the case shift lever is actuated.

'7, Case shift mechanism for ty writing and like machines comprising ali y actuated case shift lever, a detent lever carried by and moi'm'tedfor pivotal movement on said case shift lever and cooperative with acase shifted part to prevent rebound there of from normal position, aspring which moves said detent lever to effective position, a stop whichcoacts with said detent lever when the par-ts are in normal position tocompel a movement of the detent lever around the point of its pivotalconnection with the case shift lever and thereby positively withdrawsaid detent lever from effective engagement with said case shifted partwhen the case shift lever is actuated, and a lost motion connectionbetween said case shift lever and the case shifted part, whereby apreliminary movement of the case shift lever may be effectedindependently of the case shifted part in order to start to positivelywithdraw the detent lever under control of said stop before motion istransmitted to the case shifted part.

8. Case shift mechanism for typewriting and like machines comprisingacase shift frame, parallel arms on which said frame is supported, theconstruction and arrangement of the parts being such that the free endof one of said arms approaches the,

case shift frame as the latter is moved from normal position, a detentlever carrying an anti-friction roller, a case shift key, andautomatically actuated controlling means cooperated with said detentlever for wedging the said roller thereon betweenthe case shift frameand one of said parallel arms when said frame returns to normal positionand for positively withdrawing the roller from such wedging positionwhen the case shift frame is shifted from normal position, saidcontrolling means comprising a spring for moving said detent lever toeffective position, and a stop with which said detent lever coacts toeffect a positive withdrawal thereof from effective position.

9. Case shift mechanism for typewriting and like machines comprising acase shift frame, parallel arms on which said frame is supported, theconstruction and arrangement of the parts being such that the free endof one of said arms approaches the case shift frame as the latter ismoved from normal position, a detent lever carrying an antifrictionroller, a case shift key, a spring acting on said detent lever forwedging the said roller thereon between the case shift frame and one ofsaid parallel arms when said frame returns to normal position, a stoption and which when the case shift lever is actuated holds one end ofthe detent lever while it is being given a bodily movement with the caseshift lever, thereby positively withdrawing the detent lever against theforce of its spring from the path ofsaid part with which it coacts.

Signed at Stamford, in the county of Fairfield and State ofConneoticut,this 27th day of May, A. D. 1929.

GEORGE G. GOING.

with which said detent lever coacts in the normal position of the partsfor positively withdrawing said roller from wedging engagement when saidcase shift key is actuated, and a lost motion connection between saidcase shift key and frame, whereby said key may receive an initialmovement independently of the case shift frame in order to release thewedged roller from locked engagement before the case shift frame isshifted.

10. Case shift mechanism for typewriting and like machines comprising acase shift frame, parallel arms on which said frame is supported, theconstruction and arrangement of the parts being such that the free endof one of said arms approaches the case shift frame as the latter ismoved from normal position, a detent lever carrying an anti-frictionroller shiftable into wedging engagement between said shift frame andone of said arms when the case shift frame returns to normal position, acase shift key lever by which said detent lever is carried and on whichit is pivoted, a spring by which said detent lever is moved to effectiveposition, and a stop with which said detent lever coacts in order toforce the roller out of said wedging position when the case shift frameis moved from normal position.

11. Case shift mechanism for typewriting and like machines comprising acase shift frame, a key actuated case shift lever, a detent levermounted for bodily movement with and for pivotal movement on said caseshift lever, a spring for moving said detent lever around its pivotalconnection with the case shift lever and into the path of a part mountedto shift with the case shift frame and prevent said frame fromrebounding from its normal position, and an adjustable stop with whichsaid detent lever coacts when the parts are in normal posi-v

